Fix typo in README.
Fix typo in README.

tan-vu/url-shortener-microservice,laloptk/convert-dates,laloptk/click-count,tan-vu/url-shortener-microservice,therebelbeta/clementinejs-test,laloptk/click-count,lukaskwkw/fcc-url-shortener,Ceece/timestamp-ms,laloptk/image-search,thebluegene/nightlife-app,laloptk/convert-dates,thebluegene/nightlife-app,roelver/shumicro,laloptk/usho-url-shortner,megaboy101/FCC-metadata-filer,therebelbeta/clementinejs-test,tan-vu/imaging-search-layer,megaboy101/FCC-metadata-filer,laloptk/image-search,roelver/shumicro,ZebGirouard/Cloud9-Clementine,blehr/todoApp-clementine-standard,blehr/todoApp-clementine-standard,tan-vu/imaging-search-layer,Ceece/timestamp-ms,ZebGirouard/Cloud9-Clementine,laloptk/usho-url-shortner,Ceece/whoami,lukaskwkw/fcc-url-shortener,laloptk/request-header-parser-microservice